Film | Rôle | Année |
|---|
| Erin Brockovich, seule contre tous | Kurt Potter | 2000 |
| Mémoires suspectes | Don Bresler | 1996 |
| E.T. l'extra-terrestre | Keys | 1982 |
| Sphère | Captain Harold C. Barnes | 1998 |
| En territoire ennemi 2 | President Adair T. Manning | 2006 |
| Le Temps d'un automne | Reverend Sullivan | 2002 |
| Docteur Patch | Bill Davis | 1998 |
| Neighborhoods: The Hidden Cities of San Francisco - The Fillmore | Voice of Urban Renewal (Voice) | 2001 |
| Realm of the Ancient Redwoods | Narrator | 2014 |
| Un Amour de père | Burt Kruger | 2008 |
| Lunes de fiel | Oscar | 1992 |
| Une chance pas croyable | Michael Sanders | 1987 |
| Kika | Nicholas Pierce | 1993 |
| Timerider : Le Cavalier Du Temps Perdu | Porter Reese | 1982 |
| Le Retour des morts-vivants 5 : Rave mortelle | Uncle Charles | 2005 |
| Northfork | Eddie | 2003 |
| E.T. the Extra-Terrestrial 20th Anniversary Special | Self | 2002 |
| The Making of 'E.T. the Extra-Terrestrial' | Self | 1996 |
| À double tranchant | Thomas Krasny | 1985 |
| Sans retour | Poole | 1981 |
| Femme fatale | Watts | 2002 |
| L'Ombre d'un soupçon | Cullen Chandler | 1999 |
| Downwinders and the Radioactive West | Narrator (voice) | 2021 |
| Enron: The Smartest Guys in the Room | Self - Narrator (voice) | 2005 |
| Breach of Contract | | 1982 |
| Deepwater | Herman Finch | 2005 |
| Torturing Democracy | Narrator | 2009 |
| Nazi Mystery - Twins From Brazil | Narrstor (voice) | 2009 |
| Docteur Dolittle 4 | President Sterling | 2008 |
| Nepal Beyond | Narrator | 2021 |
| Sac d'embrouilles | Detective Darren Cody | 2000 |
| Crime City | Frank | 2005 |
| Di Di Hollywood | Michael McLean | 2010 |
| Au cœur du haras | Hock | 2008 |
| La Légende de Billie Jean | Ringwald | 1985 |
| AKA Tommy Chong | Himself | 2006 |
| Les Rapaces | Doc 'The Butcher' | 1997 |
| A Time for Dancing | Wyn Michaels | 2002 |
| Espèce en voie de disparition | Steele | 1982 |
| Heart of Midnight | Sharpe/Larry | 1988 |
| The gundown | Thomas Morgan | 2011 |
| Hope & Redemption: The Lena Baker Story | Elliot Arthur | 2008 |
| One Man, One Cow, One Planet | Narrator | 2007 |
| Troubled Waters: A Turtle's Tale | Self - Narrator (voice) | 2019 |
| Connected: An Autoblogography About Love, Death & Technology | Narrator (voice) | 2011 |
| These Amazing Shadows | Self | 2011 |
| Shadow of Fear : l'Engrenage | Congressman Henderson | 2004 |
| Jack Herer L Empereur Du Chanvre | Narrator | 1999 |
| États-Unis, la guerre intérieure | Narrator | 2023 |
| Adopt a Sailor | Richard | 2008 |
| Suddenly Naked | Lionel Heathcote | 2001 |
| Un homme amoureux | Steve Elliott | 1987 |
| This Is Not a Movie | | 2011 |
| The Basket | Martin Conlon | 2000 |
| Purpose | Bernard Elias | 2002 |
| National Geographic : L'Évangile selon Judas | | 2006 |
| National Geographic : L'Évangile selon Judas | Narrator | 2006 |
| Last Call | Xuave | 1999 |
| A Grande Arte | Peter Mandrake | 1991 |
| En Lettres de Sang | Dennis Burke | 2000 |
| Empty Oceans, Empty Nets | Narrator (voice) | 2002 |
| Le Vol Du Blue Yonder | Max Knickerbocker | 1985 |
| Heartbreakers | Blue | 1984 |
| Out | Rex | 1982 |
| Amour déloyal | Edward Warren | 1991 |
| What If Cannabis Cured Cancer | Narration | 2010 |
| Le grand rôle | Rudolph Grichenberg | 2004 |
| Slayground | Stone | 1983 |
| Here | Storyteller | 2011 |
| I am Fishead | narrator | 2011 |
| Buffalo Girls | Buffalo Bill Cody | 1995 |
| Marriner Eccles: Father of the Modern Federal Reserve | Narrator | 2021 |
| Texas Gold | Narrator | 2008 |
| Strange Culture | Self | 2007 |
| Two for Texas | Jim Bowie | 1998 |
| Seeds Of Doubt | | 1998 |
| Midwives | Stephen Hastings | 2001 |
| A Cloud Never Dies | Narrator (voice) | 2022 |
| Last Will | Judge Garner | 2011 |
| Cul-de-sac | Gene Gere | 1997 |
| Sunseed: The Journey | Narrator (voice) | 2020 |
| Cross Creek | Norton Baskin | 1983 |
| Angel Azul | Narrator | 2014 |
| Echoes in the Darkness | William Bradfield Jr. | 1987 |
| Long Distance Revolutionary: A Journey with Mumia Abu-Jamal | Self | 2013 |
| Fields of Gold | Narrator | 2023 |
| Les Liens du sang | John Traveller | 2003 |
| LE PRIX DE L'INDISCRÉTION | Detective Roos | 1998 |
| The Ghost Army | Narrator (Voice) | 2013 |
| Child's Cry | Matt Townsend | 1986 |
| Best Kept Secrets | Frank Mitchell | 1984 |
| Jerry Brown: The Disrupter | Self | 2022 |
| Tell Me a Riddle | Young David | 1980 |
| Sur le chemin… l’art de lâcher prise sans abandonner | Narrator | 2021 |
| The First 100 Years: A Celebration of American Movies | Narrator | 1995 |
| Drug War 2022 | Deacon Vivyan | 1996 |
| Soldiers Of Conscience | Self | 2007 |
| Alaska's Great Wilderness Denali: The Living Edens | Narrator | 1997 |
| Route 9 | Sheriff Dwayne Hogan | 1998 |
| La Rançon de la gloire | Crooker | 2015 |
| National Geographic Special: Secret Cities of the Amazon | | |
| People vs. Jean Harris | George Bolen | 1981 |
| Almost Thirteen | Narrator | 2020 |
| That Eye, the Sky | Henry Warburton | 1995 |
| Out of the Blue - The Definitive Investigation of the UFO Phenomenon | Narrator (voice) | 2003 |
| Contrary Warriors: A Film of the Crow Tribe | Narrator (voice) | 1985 |
| Olompali: A Hippie Odyssey | narrator | 2019 |
| For the Rights of All: Ending Jim Crow in Alaska | Self - Narrator (voice) | 2009 |
| Rise Above the Mark | Narrator | 2012 |
| Moment of Contact | Narrator (voice) | 2022 |
| Call of Life: Facing the Mass Extinction | Narrator | 2010 |
| On a Marché sur Bangkok | Burt Lowell | 2014 |
| Cold War on Ice: Summit Series '72 | Narrator | 2012 |
| Strangers Kiss | Stanley, the Director | 1983 |
| Right to Play | Narrator | 2012 |
| Les Diggers De San Francisco | | 1998 |
| Hippies | Self | 2007 |
| The Atomic Tree | Narrator | 2019 |
| The Secrets of 007 | Narrator (voice) | 1997 |
| Murder in My Mind | Arthur Lefcourt | 1997 |
| The Weight of a Feather: The Liberty Wildlife Story | Narrator | 2022 |
| Americana | Ben | 2016 |
| National Geographic's Storm of the Century | Self - Narrator (voice) | 1998 |
| Collision Course: Labor Management Relations in America | Narrator | 1988 |
| Die Laughing | Davis | 1980 |
| Illicit: The Dark Trade | Self - Narrator (voice) | 2008 |
| No Deposit | Police Chief Williams | 2015 |
| Oil on Ice | Narrator | 2004 |
| The Last Stand | Narrator (voice) | 2022 |
| L'Échappée belle | Le Père | 2015 |
| Abus de Pouvoir | Col. Andrew Case | 1994 |
| Green Fire | Aldo Leopold (voice) | 2011 |
| Dans l'enfer d'Alcatraz | Courtney Taylor | 1980 |
| Paolo Soleri: Beyond Form | Narrator | 2013 |
| Jack Kerouac: King of the Beats | Narrator | 1985 |
| Good Kill | Langley | 2015 |
| Bad Faith | Narrator (voice) | 2024 |
| Unconquered | Richmond Flowers Sr. | 1989 |
| Condamné au silence | Sam Fischetti | 1987 |
| Avalanche: The White Death | Narrator | 1998 |
| The Co-op Wars | Narrator (voice) | 2021 |
| Hollywood's Magical Island: Catalina | Narrator (voice) | 2003 |
| National Geographic Explorer: The Battle For Midway | Himself - Narrator | 1999 |
| The Sunday Man | The Voice | 2007 |
| Vampire Forensics | | 2010 |
| Carlos Castaneda: Enigma of a Sorcerer | | 2004 |
| The Man Inside | Henry Tobel | 1990 |
| Girl on the Edge | Hank Taylor | 2015 |
| Poison in the Rockies | Narrator (voice) | 1990 |
| In the Light of Reverence | Narrator (voice) | 2001 |
| The Four Corners: A National Sacrifice Area? | Narrator (voice) | 1983 |
| Execution of Justice | Harvey Milk | 1999 |
| Missing in Tibet | Narrator | 1999 |
| 1 Mile To You | Principal Umber | 2017 |
| Baja Oklahoma | Slick Henderson | 1988 |
| Grizzly Diaries | Narrator (voice) | 2003 |
| Huxley on Huxley | Self | 2009 |
| Bon voyage | Alex Winckler | 2003 |
| The Program | Narrator (voice) | 2024 |
| Murder on Shadow Mountain | Dennis 'Denny' Traynor | 1999 |
| Grand Canyon: A Journey of Wonder | Narrator | 2009 |
| Phénomènes | John Ringold | 2003 |
| Who Wants to Live Forever? The Wisdom of Aging. | Himself | 2016 |
| Polanski y los ojos del mal | Himself | 2002 |
| The Brain Fitness Program | | 2008 |
| Alaska Far Away | Narrator | 2008 |
| The Wednesday Woman | Don Wigulow | 2000 |
| The Tribe | Voice | 2005 |
| Spielberg | Self | 2017 |
| The Hebrew Hammer | JJL Chief Bloomenbergensteinenthal | 2003 |
| Le Retour des morts-vivants 4 : Necropole | Uncle Charles | 2005 |
| Stacking | The Photographer | 1987 |
| Waldo Salt: A Screenwriter's Journey | Narrator (voice) | 1990 |
| The Etruscan Smile | Professor | 2018 |
| Robert Bly: A Thousand Years of Joy | Self | 2015 |
| The UFO Experience | | 1982 |
| The Hippie Temptation | Digger | 1967 |
| A Single Woman | Maury Maverick | 2008 |
| Keeper of the City | Frank Nordhall | 1991 |
| The Beatles, Hippies & Hells Angels: Inside the Crazy World of Apple | Himself - Narrator | 2017 |
| Search for the Submarine I-52 | Narrator | 2000 |
| The Mayo Clinic | Self - Narrator (voice) | 2018 |
| Scorned and Swindled | Anthony Ristelli | 1984 |
| Summer of Love | Himself | 2018 |
| Dalva | Michael | 1996 |
| Isabel's Choice | Wynn Thomas | 1981 |
| Renaissance d'un champion | Ike Epstein | 2007 |
| The War Prayer | Narrator | 2005 |
| The Remarkable Life of John Weld | Narrator | 2018 |
| Moonlight et Valentino | Paul | 1995 |
| The Reality of Truth | Self | 2016 |
| I Know What I Saw | Narrator (voice) | 2009 |
| With One Voice | Narrator | 2009 |
| Hemingway & Gellhorn | Maxwell Perkins | 2012 |
| Bare Knuckle Filming: The Construction of Northfork | Narrator | 2003 |
| Earth and the American Dream | Reader (voice) | 1992 |
| Bag It | Self | 2011 |
| The Sacramento River of Life | Narrator | 2005 |
| Karmapa - Two Ways of Divinity | Narrator, English version (voice) | 1998 |
| Climbing Redwood Giants | Self - Narrator (voice) | 2009 |
| The Phenomenon | Narrator (voice) | 2020 |
| Commune | self, Black Bear resident | 2005 |
| Oceans in Glass | Narrator | 2011 |
| Os Mistérios de Lisboa ou What The Tourist Should See | Narrator (voice) | 2009 |
| Living a Lie | Matt | 1991 |
| Woody Guthrie: Ain't Got No Home | Narrator (voice) | 2006 |
| La Fille qui croyait aux miracles | Sam Donovan | 2021 |
| Valparaiso | Edward G. Drexler | 2012 |
| As If They Were Angels | Narrator | 2018 |
| Fog City Mavericks | Self - Narrator (voice) | 2007 |
| A Seduction in Travis County | Frank Maguire | 1991 |
| Polanski, le travail à l'oeuvre | Self | 2019 |
| A Coup in Camelot | Narrator (voice) | 2015 |
| San Francisco Stories | Narrator/SInger | 2021 |
| Good Men | Self | 2024 |
| Pretty Slick - The Deep Water Horizon Environmental Coverup - Extended Directors Cut | Narrator | |
| Jack the Dog | Alfred | 2001 |
| Unelmoija ja unikansa | Narrator | 1998 |
| Chattahoochee: From Water War to Water Vision | Narrator | 2010 |
| O Mother Gaia: The World of Gary Snyder | Self | 2025 |
| 24 Hours After: Asteroid Impact | Narrator | 2009 |
| The Peyote Road | Narrator | 1994 |
| Titanic: Breaking New Ground | Narrator | 1998 |
| National Geographic: Surviving Everest | Narrator | 2003 |
| Hayden's Corner | Narrator (voice) | |
| Revolution: The Legacy of the Sixties | | 2017 |
| Spirit of Golf | Self | 2023 |
| A Daring Journey: From Immigration to Education | Narrator | 2015 |
| Finding Anastasia | Narrator | 2008 |
| About Face: Jewish Refugees in the Allied Forces | Narrator (voice) | 2020 |
| Saving Atlantis | | 2018 |
| Unprecedented: The 2000 Presidential Election | Narrator | 2002 |
| Moment of Contact: New Revelations of Alien Encounters | Narrator (voice) | 2025 |
| The Atomic Bowl: Football at Ground Zero -- And Nuclear Peril Today | Narrator | 2025 |
| Cornellskop: Freedom From Fear | Narrator | |
| Darryl Henriques Is in Show Business | Self | 2006 |
| Black Mountain Blues | | |
